Noise-muffler.



PATENTED JULY 28, 1903.

P RAUGH. NOISE MUFFLER.

APPLICATION TILED we. 28. 1902.

2 SHEETS-SHEET 1- NO MODEL.

% INVENT BY 5 ATTORNEYS.

PATENTED JULY 28, 1903.

P. RAUGH. NOISE MUFFLER. APPLICATION rum) m. 28, 1902.

2 SHEETS-SHEET 2.

N0 MODEL.

IN V

WITNESSES A TTOHNE Y8.

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Patented July 28, 1903.

PATENT OFFICE.

PHILIP RAUOI-I, or BRAD'FoRn'PENNsYLvANIA.

NOISE-MUFFLER.

SPECIFICATION forming part of Letters Patent N 0. 734,749, dated July 28, 1903.

Application filed August 28,1902.

To all whom, it may concern:

Be it known that I, PHILIP RAUGH, a citizen of the German Empire, residing at Bradford, in the county of McKean and State of Pennsylvania, have invented certain new and usef ul Improvements in Noise-Mufflers for Automobiles, &c., of which the following is a specification.

The present invention relates to mufflers used on gas-engines, and is designed to obviate the objectionable noises coincident with the successive explosions of the fuel-gases. In automobiles and motor-bicycles it is essential that the engines and their appurtenances be of the least weight and occupy the least space commensurate with their strength and efficiency. My improved muiiler belonging to the latter category fulfils these conditions.

The invention consists of a noise-muflier comprising a central main supply-tubeprovided with a series of perforations in its wall, means for closing the outer end of said supply-tube, a plurality of cup-shaped mufflerplates arranged in pairs on said supply-tube, so as to form a series of interior mufflingchambers communicating with said perforations, said muffler-plates being provided with small exit-passages and extension-flanges on some of said muffler-plates at their circumference, said flanges being also provided with small exit-passages and forming an exterior series of muffling-chambers communicating with and'surrounding the interior series of chambers, as will be fully described hereinafter and finally pointed out in the claims.

In the accompanying drawings, Figure 1 shows a vertical central sectionof my improved muffler on line 1 1, Fig. 2. Fig. 2 is a plan view of the muffler, and Fig. 3 is a horizontal section on line 3 3, Fig. 1.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, 0 is a pipe screwthreaded at each end and provided with perforations c.

J L N are cup-shaped muffler-plates, and I K M are similar cup-shaped plates, but provided with flanges. These plates are provided each at its center wit-h an opening, so as to be placed upon the pipe (3, and are used ably retarded.

in the condition in which they come from the SerislNo. 121,319. (No model.)

' foundry-that is, rough-edged, as indicated in the drawings. Placing-these plates upon the pipe one superposed upon the other they form muffling-chambers, and as the exit-openings, due to the irregularity of the edges, are very'small the efflux of the gases and sound is considerably retarded.

P indicates a hollow cylinder open at one end and having a circular opening in its closed-end, through which passes the pipe 0. T is a hollow cylinder also open at one end, having a hole in its closed end, through which passes the pipe 0. These cylinders are placed so that their open ends face each other. Suitable coupling-joints consisting of a union A, screwed upon the pipe 0 at its upper or inlet end and projecting therefrom, so as to be fastened to the exhaust-pipe of the motor, and a cap Bhold these plates and cylinders together by pressure and form thereby the noisemuiiler.

The path of the gases and of the sound may be described thus: The muffler being attached to the motor by the screw-threaded union A, the successive audible and noisy eX- plosions take place in the cylinder of the motor, and the exhaust-gases and sound due to these explosions pass from the cylinder to the pipe 0 and pass through the perforations c to the separate chambers D, E, and F. Due to the smallopenings d,where the rough edges of the castings meet, the sound is consider- Passing into the second series of mnffling-chamb'ers G and H it is again considerably retarded by the small openings g, and, finally, after passing along the circuitous path in the chambers R and S, as indicated by the arrows,the exhaust-gases leave the muffler, but the noise due to the successive explosions is completely muffled. The sound has been'dampened in its course five times without back pressure, as the cross-section of the exit for the gases is smaller by far than the cross-section of themufflerplate.

. It is obvious that for smaller motorsa less number of muflier-plates may be employed and the parts of thernuffler reducedin size, while for larger motors a largernumber of plates up to any required number may be used.

Z indicates a smalldischarge-cock communicating with the interior of the supply-tube and with the outer atmosphere. This cock permits the direct escape of such quantity of the Waste gases as may be desired. It is obvious that this cock may be omitted and an entirely-closed cap employed for the lower end of the supply-tube in case no direct escape of the gases is desired.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A noise muffler, consisting of a central main supply-tube provided with a series of perforations in its wall, means for closing the outer end of said supply-tube, a plurality of cup-shaped muffler-plates arranged in pairs on said supply-tube so as to form a series of interior mufliing-chamhers communicating with said perforations, said muiiler-plates being provided with small exit-passages,and extension-flanges on some of said muffler-plates at their circumference, said flanges being also provided with small exit-passages and forming an exterior series of mu'fiiing-chamhers communicating with and surrounding the interior series of chambers, substantially as set forth.

2. A noise-muffler, consisting of a central main supply-tube provided with a series of perforations in its Wall, means for closing the outer end of said supply-tube, a plurality of cup-shaped muffler-plates arranged in pairs on said supply-tube so as to form a series of interior muffling-chambers communicating with said perforations, said muffler-plates being provided With small exit-passages, extension-flanges on some of said muffler-plates at their circumference, said flanges being also provided with small exit-passages and forming an exterior series of muffling-chambers communicating with and surrounding the interior series of chambers, an interior cylinder surrounding the inuflier-plates and open at one end, and an exterior cylinder open at one end surrounding said interior cylinder and inverted over the same, substantially as set forth.

3. A noise-muiiier, consisting of a central main supply-tube provided with a series of perforations in its Wall, means for closing the outer end of said supply-tube, a plurality of cup-shaped muffler-plates arranged in pairs on said supply-tube so as to form a series of interior muffiing -chambers communicating with said perforations, said muffler-plates being provided with small exit-passages, extension-flanges on some of said muffler-plates at their circumference, said flanges being also provided with small exit-passages and forming an exterior series of muffiing-chambers communicating with and surrounding the interior series of chambers, an interior cylinder surrounding the muffler-plates and open at one end, the closed end of said cylinder being mounted on said central supply-tube, an exterior cylinder open at one end surrounding said interior cylinder and inverted over the same, the closed end of said exterior cylinder being also mounted on said central supply-tube, and a screw-coupling screwed down upon the supply-tube, at the ingoing end of the same and clamping said muffler-plates and cylinders in position, substantially as set forth.

t. A noise-muffler, consisting of a central main supply-tube provided with a series of perforations in its wall, means for closing the outer end of said supply-tube, a plurality of cup-shaped muffler-plates arranged in pairs on said supply-tube so as to form a series of interior muffiing-chambers communicating with said perforations, said mu ffler-plates being provided with small exit-passages, extension-flanges on some of said muffler-plates at their circumference, said flanges being also provided with small exit-passages and forming an exterior series of mufiiing-chambers communicating with andsurrounding theinterior series of chambers, and a dischargecock communicating with the interior of said supply-tube for controlling the direct exhaust of a portion of the Waste gases into the atmosphere, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed mynamein presence of two subscribing Witnesses.

PHILIP RAUCH.

Witnesses:

Gno. M. HOLLEY, EARL HoLLnY. 

